Aquarium covering



FIG. 1 is a front elevational view of an aquarium covering showing my new design;

FIG. 2 is a back elevational view thereof;

FIG. 3 is a right elevational view thereof;

FIG. 4 is a bottom elevational view thereof;

FIG. 5 is a top elevational view thereof; and,

FIG. 6 is an exploded isometric elevational view thereof.

The even spaced broken lines and dash-dot-dot-dash broken lines in FIG. 6 are included for the purpose of illustrating portions of the aquarium covering and form no part of the claimed design. 

CLAIM The ornamental design for an aquarium covering, as shown and described. 